Portable developing-cabinet.



C. G. GREEN.

PORTABLE DEVELOPING CABINET.

APPLIOATION IILED JUNE 30, 1913.

1, 1 1 7,035. Patented Nov. 10, 1914.

Witnesses.

i CHARLES GEORGE GREEN, OF TORONTO, ONTARIO, CANADA.

PORTABLE DEVELOPING-CABINET.

Specification of Letters Patent.

Patented Nov. 10, 1914.

Application filed June 30, 1913. Serial No. 776,618.

To all whom it may concern:

Be it known that I, CHARLES GEORGE GREEN, a subject of the King of GreatBritain, and resident of the city of Toronto, county of York, Provinceof Ontario, in the Dominion of Canada, have invented certain new anduseful Improvements in Portable Developing-Cabinets, described in thefollowing specification and illustrated in the accompanying drawings,that form part of the same.

The principal objects of the present invention are, to provide aportable cabinet for the use of photographers in developing negatives,loading holders and such other purposes as may be required where aproper dark room is not available and which is iarticularly adapted tobeing carried around, and particularly designed for the use of amateurs.

A further object of the present invention is to devise a portabledeveloping cabinet which may be manufactured and sold at very low costand which is of very light weight and occupies the smallest possiblecompass convenient for carrying.

The principal feature of the invention consists in the novelconstruction and arrangement of parts, whereby a readily collapsiblelight proof casing is formed.

In the drawings, Figure 1 is a perspective view of my improveddeveloping cabinet, one of the end coverings being removed therefrom.Fig. 2 is a perspective view showing the cabinet set up ready for use.Fig. 3 is a vertical longitudinal sectional view of one end of thecabinet shown ready for use. Fig. 1 is a cross sectional view of thecabinet collapsed.

Like numerals of reference indicate corresponding parts in each figure.

Referring to the drawings, 1 is a rectangular shaped casing formed froma sheet of corrugated cardboard packing material comprising outer andinner fiat sheets of cardboard material 2 and 3 with an intermediatecorrugated sheet 4 all united together. The sheet is bent longitudinallyof the corrugations of the center strip into the rectangular shapedesired and the edges are united preferably in the bottom side 5, a lapjoint being made to form a rigid and a light proof joint.

6 are strips of thin sheet metal secured to the inner side of the bottom5 adjacent to the ends of the casing having a raised central portion 7in which are pivotally held the rectangular shaped wire loops 8 whichare formed to fit snugly against the inner walls of the casing to holdit from collapsing. These loops are arranged so that when it is desiredto collapse the casing they may be swung downwardly flat against thebottom and the sides of the easing will then fall in together asillustrated in Fig. 4.

9 are angle shaped strips preferably formed of thin sheet metal andsecured to the outer sides of the casing 1 adjacent to the ends andforming the outwardly proj ecting flanges 10. The strips 9 are formed atthe ends to allow two of the corners of the casing to flatten out andthe other meeting ends are mitered to add rigidity to the casing when inits extended position.

11 are caps formed of a suitable flexible fabric shaped to fit over theends of the casing 1 and to extend around the flanges 10 being held inplace at each side of the flanges by the elastic bands 12 and 13. Thearrangement of the flanges insures a thoroughly light proof connectionbetween the end caps and the casing, a double seal being provided ateach side of the flange.

11 are circular shaped holes cut in the back 15 of the casing 1 in whichare secured the sleeve members 16 formed of a suitable light prooffabric, said sleeves being adapted to encircle the arms of the operatorand having suitable bands secured thereto.

17 and 18 are openings in the top and front sides of the casing 1 inwhich are secured in a light proof joint sheets of ruby glass orcorresponding material. The peculiar material of which the casing 1 isformed allows of the securing of the glass or other colored sheets insaid openings in a light proof joint as the said material is formed witha double wall and a lap joint may be made very readily. By providing theopenings 17 and 18 I allow provision for ample light within the casingand also that the operator may follow clearly the operation of his handswithin the casing when inserted through the holes 14.

19 is a small opening arranged in the back 15 between the holes 14 andalso covered with a ruby light. This is provided so that the operatormay look through a negative by holding the negative between said holeand the opening in the front s1 e.

20 is a small bracket secured to the front side of the device andadapted to receive a Wire bracket member 21 which carries a candleholder 22 at its outer end so that the operator may Work in a dark placeif desired or do any developing by night When other lighting means forhis cabinet are not available.

Iam aware that various forms of portable or collapsible developingcabinets have been devised but the main feature of the present inventionconsists in its simplicity and durability of construction, its lightWeight and the manner in Which it may be collapsed and carried withconvenience.

A further and most important feature is that the cheapness ofconstruction enables it to be placed upon the market at a very moderateprice.

\Vhat I claim as my invention is 1. A portable developing cabinet,formed of a sheet of stiff board material, folded to form a rectangularopen ended casing having the meeting edges joined to form a light proofjoint, means for holding the casing from collapsing laterally,rectangular shaped caps adapted to close the open ends of said casing ina light proof joint, ruby lights arranged in the sides of said casing,and light proof sleeve members connected to arm holes in one side ofsaid casing.

2. A portable developing cabinet, formed of a length of stiff boardmaterial folded to form a rectangular open ended casing the bendsthereof being flexible, rectangular shaped metal loops pivotally securedto the inner wall of one of the sides of said casing adjacent to theends adapted to hold the sides from collapsing laterally, light proofcaps of flexible material adapted to close the ends of said casing,sleeves of light proof material connected to the arm holes in one sideof said casing, and ruby lights arranged in the sides of said casing.

3. A portable developing cabinet formed of stiff board. material foldedto form a rectangular casing open at the ends, means for holding thecasing to its rectangular shape, metallic flanges rigidly secured to theouter sides of said casing adjacent to the end, caps of light prooffabric adapted to close said ends and to extend over said flanges,flexible bands encircling the inner ends of said caps at each side ofsaid flanges to secure said caps in place and form a light proof joint,ruby lights arranged in the sides of said casing and light proof sleevemembers extending from arm holes in one one side of said casing.

Signed at the city of Toronto, Ontario, Canada, this 24th day of June,1913.

CHARLES GEORGE GREEN.

Witnesses:

H. G. TRIMBLE, D. S. TOVELL.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, I). G,

